Each antibody binds to a specific antigen; an interaction similar to a lock and key. An antibody (Ab), also known as an immunoglobulin (Ig), is a large, Y-shape protein produced by plasma cells that is used by the immune system to identify and neutralize pathogens such as bacteria and viruses.The antibody recognizes a unique molecule of the harmful agent, called an antigen, via the variable region.he membrane-bound form of an antibody may be called a surface immunoglobulin (sIg) or a membrane immunoglobulin (mIg). It is part of the B cell receptor (BCR), which allows a B cell to detect when a specific antigen is present in the body and triggers B cell activation.
The Beginnings Slavery in America began in 1619, meaning that was when slaves began to show up in the original colonies. However, this practice had happened even in the Spanish colonies as early as the 1560s. What has to be remembered is that slaves weren't always the way we think of them.
By 1860, there were about four million slaves in the United States. On April 16, 1862, Abraham Lincoln, who was the US president at the time, signed the Compensated Emancipation Act, which freed more than 3000 slaves in the District of Columbia.y 1860, there were about four million slaves in the United States. On April 16, 1862, Abraham Lincoln, who was the US president at the time, signed the Compensated Emancipation Act, which freed more than 3000 slaves in the District of Columbia.